Subtitute

Subtitute: verb. To subtitute is to replace a tit with another tit. The most common subtitution is the replacement of a tit from one tit family with a tit from the same tit family. During serious tit epidemics, however, it is not uncommon to witness natural subtitutions such as grey tits replacing great tits and invasive blue tits replacing yellow tits, particularly in countries such as Taiwan. Most subtitutions are monitored by the Truly International Titwatchers (The TITs) who affectionately call themselves titties.